CN213272641U - Printing trade purifies VOCs's distributed energy system - Google Patents
Printing trade purifies VOCs's distributed energy system Download PDFInfo
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- 239000003345 natural gas Substances 0.000 claims abstract description 40
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 39
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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Abstract
The utility model discloses a distributed energy system for purifying VOCs in printing industry, which relates to the field of waste gas treatment in printing industry, and comprises a printing workshop, a fan I, a zeolite runner, a heat exchanger, an absorption refrigerator, a chimney, a natural gas generator set and a fan II; the utility model discloses a zeolite runner module adsorbs desorption VOCs waste gas, and the VOCs waste gas of desorption gets into the supplementary burning electricity generation of natural gas generating set, and absorption refrigeration unit absorbs waste gas waste heat refrigeration, has recycle VOCs waste gas, reduces ozone generation potentiality, improves energy utilization's beneficial effect.
Description
Technical Field
The utility model relates to a printing trade purifies VOCs's distributed energy system belongs to printing trade exhaust-gas treatment field.
Background
Volatile Organic Compounds (VOCs) are a general term for volatile organic wastes generated in the production process in the industrial field, and are important precursors formed by ozone and PM2.5, and the ozone and PM2.5, which are main hazardous substances for environmental pollution, must be effectively controlled. VOCs are highly hazardous: explosion and fire. For example, the aliphatic hydrocarbon substances in the waste gas of VOCs are inflammable and explosive, and become a potential safety hazard of fire or explosion. ② harming human body. VOCs waste gas is easily emitted into the atmosphere, and the human health is directly harmed. When the indoor VOCs reach a certain concentration, people can feel headache, nausea, vomiting, hypodynamia and the like in a short time, and can be convulsion and coma in severe cases, and the liver, the kidney, the brain and the nervous system of people can be injured, so that serious consequences such as hypomnesis and the like can be caused, and even cancer can be generated. Chemical pollution. Excessive VOCs emission can increase PM2.5 and O in the atmosphere3Content, environmental problems such as haze, photochemical smog and the like are easily caused.
Research shows that a large amount of raw and auxiliary materials such as ink, a cleaning agent, a diluent, fountain solution, an adhesive and the like are used in the printing process, the organic solvent content is high, the organic solvent is a main source for VOCs emission in the printing industry, and the organic solvent is extremely easy to volatilize into the environment, seriously pollutes the atmospheric environment and deteriorates the air quality. The conventional technology for treating VOCs in the printing industry is a zeolite concentration rotating wheel and direct-fired oxidation furnace technology, and the principle is that waste gas is introduced into a zeolite rotating wheel for concentration, enters a direct-fired oxidation furnace for incineration and is discharged through a chimney. However, this technique has the disadvantage of burning the VOCs directly without utilizing the energy lost therein.
The distributed energy system is defined relative to the traditional centralized energy supply of large-scale power stations and power grids, and means that the power generation system is distributed in a small-scale, modular and decentralized modeThe mode of (2) is arranged near the energy user, and the energy system can independently output cold, heat and electricity to the user. Compared with the traditional centralized energy supply, the distributed energy system has the following advantages: extremely low power transmission and distribution loss; the system can be adjusted according to the heat or electricity demand so as to increase the annual equipment utilization hours; the engineering construction cost and the installation and maintenance cost are low; each distributed micro power station is independent of each other, depends on micro grid control, has high power supply reliability, and can remotely monitor regional power quality and performance. The distributed energy system makes up the defects of a large power grid in the aspects of safety, environmental protection and reliability, provides possibility for complementary comprehensive utilization of various energy sources, realizes reasonable cascade utilization from high-grade energy sources to low-grade energy sources, is efficient and energy-saving, and has energy efficiency of 80-90%. The distributed energy adopts advanced energy conversion technology, reduces the emission of pollutants as much as possible, disperses the emission and is convenient to be absorbed by surrounding vegetation. Meanwhile, the distributed energy utilizes the advantages of small emission and low emission concentration, and can realize the resource recycling of main atmospheric environmental pollutants and greenhouse gases. The distributed energy adopts clean energy fuel, greatly reduces the emission of harmful gas and SO2PM2.5, solid waste and sewage are close to zero emission.
Disclosure of Invention
In order to solve the printing trade, VOCs discharges and pollutes the atmospheric environment, harm health, the problem of the green development of restriction trade, the utility model discloses an administer the thinking that atmospheric pollutants and distributed energy system combined together, to many and the concentration of printing enterprise, the characteristics that the printing workshop waste gas amount of wind is big and concentration is low, a distributed energy system that printing trade purifies VOCs is provided, with the VOCs recovery processing of printing workshop, realize discharge to reach standard, and with the required electric energy in workshop, cold volume integration, this system is energy-efficient, VOCs exhaust emission problem in the printing trade has been solved, ozone generation potentiality has been reduced, energy saving and emission reduction's target has been realized.
A distributed energy system for purifying VOCs in printing industry comprises a printing workshop 1, a fan I2, a zeolite rotating wheel 3, a heat exchanger 4, an absorption refrigerator 5, a chimney 6, a natural gas generator set 7 and a fan II 8; the printing workshop 1 is connected fan I2, is divided into three mutually isolated subregion on the zeolite runner 3: an adsorption zone, a desorption zone and a cooling zone; fan I2 is connected with 3 adsorption zones of zeolite runner, the adsorption zone other end and atmosphere UNICOM, fan I2 still is connected with 3 cooling zones of zeolite runner, the 3 cooling zone other ends of zeolite runner are connected with 4 entry ends of heat exchanger, 4 exit ends of heat exchanger are connected with 3 desorption zones of zeolite runner, the desorption zone other end is connected with fan II 8, fan II 8 is connected with absorption refrigerator 5, absorption refrigerator 5 respectively with chimney 6, 1 refrigeration zone in printing workshop, 7 combustors of natural gas generating set are connected, natural gas generating set 7 is connected with 1 in printing workshop, the electric energy of production supplies to 1 in printing workshop.
And a tail gas outlet of the natural gas generator set 7 is connected with the heat exchanger 4.
And a tail gas outlet of the natural gas generator set 7 is connected with the absorption refrigerator 5.
The utility model discloses the system is when using, the waste gas that contains VOCs of workshop 1 is drawn into zeolite runner 3 by fan I2, the adsorption zone of zeolite runner 3 adsorbs the back, gaseous direct evacuation after the purification, the gas that the cooling zone came out becomes hot desorption zone of reentrant zeolite runner 3 after being heat exchanged by heat exchanger 4, the VOCs desorption of adsorption on the hot gas is with zeolite runner 3, the concentrated waste gas that contains VOCs of forming heat is drawn into absorption refrigerator 5 by fan II 8, the concentrated waste gas that contains VOCs of heat is absorbed and after the refrigeration treatment by absorption refrigerator 5, clean tail gas passes through 6 empties of chimney, the cold volume of production is supplied with workshop 1 refrigeration, the absorbed waste gas that contains concentrated VOCs of absorption refrigerator 5 gets into natural gas generating set 7 combustion chamber and burns the electricity generation, the electric energy supply that natural gas generating set 7 obtained is used for workshop 1, the clean hot tail gas of a part that natural gas generating set 7 produced gets into heat exchanger 4 and comes out with zeolite 3 cooling zone After the heat exchange of the gas, the cooled purified gas is emptied, the natural gas generator set 7 generates the remaining clean hot tail gas to supply heat to the absorption refrigerator 5, and the system can independently output cold, heat and electricity to a printing workshop for utilization, thereby forming a distributed energy system.
The utility model has the advantages that:
1. the utility model provides a VOCs in the production of whole printing workshop discharge the problem that pollutes atmospheric environment, harm health, the green development of restriction trade, do not produce other harmful substance and discarded object.
2. The utility model discloses still can produce electric power and provide cold volume, realize energy self-sufficiency.
3. The utility model discloses make full use of the energy step and utilized the principle, improved energy utilization rate, the high-grade energy is used for the electricity generation, and the low-grade energy is used for refrigeration and heating desorption gas.
Drawings
Fig. 1 is a schematic diagram of system connection according to embodiment 1 of the present invention;
in the figure, 1-the printing shop; 2-a fan I; 3-a zeolite wheel; 4-a heat exchanger; 5-absorption refrigerator; 6-a chimney; 7-a natural gas generator set; 8-a fan II; 9-VOCs-containing exhaust gas; 10-purified gas; 11-concentrated VOCs-containing waste gas; 12-electrical energy; 13-Cold volume.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments. It is obvious that the described embodiments are only some of the embodiments.
Example 1
A distributed energy system for purifying VOCs in printing industry is shown in figure 1 and comprises a printing workshop 1, a fan I2, a zeolite rotating wheel 3, a heat exchanger 4, an absorption refrigerator 5, a chimney 6, a natural gas generator set 7 and a fan II 8; the printing workshop 1 is connected with a fan 2, and the zeolite rotating wheel is divided into three mutually isolated subareas: an adsorption zone, a desorption zone and a cooling zone; fan I2 is connected with 3 adsorption zones of zeolite runner, the adsorption zone other end and atmosphere UNICOM, fan I2 still is connected with 3 cooling zones of zeolite runner, the 3 cooling zone other end of zeolite runner is connected with 4 entry ends of heat exchanger, 4 exit ends of heat exchanger are connected with 3 desorption zones of zeolite runner, the desorption zone other end is connected with fan II 8, fan II 8 is connected with absorption refrigerator 5, absorption refrigerator 5 purifies the gas export and is connected with chimney 6, the cold volume of obtaining is UNICOM with 1 refrigeration zone in printing workshop, the absorptive waste gas is connected with the combustion chamber of natural gas generating set 7, natural gas generating set 7 is connected with printing workshop 1, the electric energy of production supplies printing workshop 1, the export of the hot tail gas that natural gas generating set 7 produced still communicates with heat exchanger 4 and absorption refrigerator 5.
The utility model discloses the system is when using, the waste gas 9 that contains VOCs of print shop 1 is drawn into zeolite runner 3 by fan I2, the adsorption zone of zeolite runner 3 adsorbs the back, the direct evacuation of purified gas 10, the gas that the cooling zone came out becomes hot desorption zone who gets into zeolite runner 3 again after being heat exchanged by heat exchanger 4, the VOCs desorption of adsorption on the hot gas with the zeolite runner, the concentrated waste gas 11 that contains VOCs of forming heat is drawn into absorption chiller 5 by fan II 8, the concentrated waste gas 11 that contains VOCs of hot back is absorbed and the refrigeration treatment back by absorption chiller 5, clean tail gas passes through chimney 6 evacuation, the refrigeration of print shop 1 is supplied with to the cold volume 13 of production, the absorbed waste gas that contains concentrated VOCs of absorption chiller 5 gets into natural gas generating set 7 and generates electricity, the electric energy 12 supply that natural gas generating set 7 obtained is used for print shop 1, the clean hot tail gas of a part that natural gas generating set 7 produced gets into heat exchanger 4 and the gas that the cooling zone After heat exchange, the cooled purified gas 10 is emptied, the natural gas generator set 7 generates the remaining clean hot tail gas to supply heat to the absorption refrigerator 5, and the system can independently output cold, heat and electricity to a printing workshop for utilization, thereby forming a distributed energy system.
The mass concentration of VOCs discharged by gravure printing of a certain printing enterprise in Yunnan is about 36.6mg/m3The amount of waste gas in the press room 1 is about 1000m3And/h, the mass of VOCs generated in the printing workshop is 36.6g/h, the VOCs are involved in the zeolite rotating wheel 3 through the fan I2, the purified gas is directly exhausted after being adsorbed in an adsorption area of the zeolite rotating wheel 3, the gas discharged from the cooling area is heated (the temperature is 200-220 ℃) after being subjected to heat exchange by the heat exchanger 4 and then enters a desorption area of the zeolite rotating wheel 3, the VOCs adsorbed on the zeolite rotating wheel are desorbed by hot gas, the hot concentrated VOCs-containing waste gas 11 (the temperature is about 200 ℃) is involved in the absorption refrigerator 5 through the fan II 8, and the hot concentrated VOCs-containing waste gas 11 is absorbed and refrigerated by the absorption refrigerator 5Then, the clean tail gas is exhausted through a chimney 6, the generated cold energy is supplied to a printing workshop 1 for refrigeration, the waste gas containing concentrated VOCs absorbed by an absorption refrigerator 5 enters a natural gas generator set 7 for combustion power generation, the electric energy obtained by the natural gas generator set 7 is supplied to the printing workshop 1 for use, a part of clean hot tail gas (with the temperature of 400-600 ℃) generated by the natural gas generator set 7 enters a heat exchanger 4 for heat exchange with gas discharged from a cooling area of a zeolite rotating wheel 3, a cooled purified gas 10 is exhausted, and the natural gas generator set 7 generates the rest clean hot tail gas for supplying heat to the absorption refrigerator 5; the mass of the VOCs introduced into the natural gas generator set 7 is about 33g/h, and the estimated average density of the VOCs is 3.5kg/m3Then, the volume of VOCs produced in 1 hour is 0.009m3(ii) a Table 1 shows the components of VOCs produced by the gravure press, and it can be seen from Table 1 that the waste gas of VOCs produced by the gravure press has the largest proportion of alkane, in which butane is mainly used and the low calorific value of butane (123560 kJ/Nm)3) The low calorific value of the VOCs is represented by the low calorific value of butane, so that the method can calculate that the VOCs generated in a printing workshop can generate 0.31 kW.h electric energy within 1 hour, can generate 2.48 kW.h electric energy within 1 day and can generate 620 kW.h electric energy within 1 year.
TABLE 1
The waste gas of VOCs in the printing workshop has high concentration before treatment, and the concentration of benzene is about 0.6 mg.m-3The total concentration of toluene and xylene was about 2.78mg · m-3The concentration of non-methane total hydrocarbons is about 23.43mg m-3According to the specification of DB11/1201-2015 volatile organic matter emission standard of Beijing in 2015, the limit value of the concentration of volatile organic matters at the unorganized emission monitoring point in the printing production activity is shown in Table 2, the standard is taken as a reference, the printing workshop far does not meet the requirement of the DB11/1201-2015 standard, after the VOCs are collected by the system, the absorption efficiency of the zeolite rotating wheel 3 is generally 90-95%, and the product of the combustion decomposition of the waste gas containing VOCs by the natural gas generator set 7 is CO2And H2O can be directly discharged, the theoretical discharge concentration of the treated VOCs waste gas discharged by the printing workshop 1 can be calculated, the printing workshop of the printing enterprise needs 500 kW.h of power generation, 500 kW.h of refrigeration and 100 kW.h of heat production as examples, a natural gas generator set selects 12V190ZDT-2, the heat consumption rate of a natural gas engine is less than or equal to 11.386 MJ/(kW.h), 9 MJ/(kW.h) is taken, and the low-grade heat productivity of the natural gas is 35.588kJ/m3The lithium bromide absorption type water chiller, i.e. the absorption type refrigerating unit, selects YRX-70, the coefficient of performance COP is 1.3, table 2 is the application of the printing enterprise, the utility model discloses a relevant parameter.
TABLE 2
As can be seen from Table 2, the concentration of VOCs in the exhaust gas was greatly reduced and the concentration of benzene was reduced to 0.06 mg.m after treatment with the system-3The total concentration of toluene and xylene is reduced to 0.28mg · m-3The concentration of non-methane total hydrocarbons is 2.30mg m-3In addition, after the discharge concentration is reduced after the treatment of the system, the corresponding SR value of the ozone generation potential is estimated to be reduced, which is beneficial to reducing the ozone concentration and achieving the purpose of environmental protection and emission reduction, and according to calculation, the SR value of the ozone generation potential of the VOCs discharged by the printing workshop is reduced from 1.91g/g to 0.19 g/g.
The energy consumption calculation formula of the system is as follows:
Q＝V×LHV (1)
in the formula: q-energy consumption of the system, MJ; v, taking the value of the consumption of the natural gas/the coefficient obtained by actual measurement to be 500; LHV-the low heat value of the natural gas/the value provided by a natural gas supply unit, wherein the natural gas generator set generates power by using the low heat value of the natural gas to drive the generator set to output electric power, and the value is 33.5 MJ;
comprehensive energy utilization rate:
the calculation result is shown in table 3, the comprehensive energy utilization rate of the system reaches 88%, which shows that the system not only treats the VOCs waste gas, but also reduces the energy consumption, improves the energy utilization rate and achieves the purposes of energy conservation and emission reduction.
TABLE 3
The utility model discloses distributed energy system indicates with power generation system on a small scale, the modular, distributed mode is arranged near with can the user, can export cold to the user independently, it is hot, the energy system of electricity, distributed energy system compensaties big electric wire netting in the security, not enough in the aspect of feature of environmental protection and reliability, comprehensive utilization for the multiple energy is complementary provides probably, the reasonable step utilization from the high-grade energy to the low-grade energy has been realized, high efficiency and energy saving, the efficiency reaches 80% ~ 90%, adopt clean energy fuel, very big reduction harmful gas's emission, the high temperature section energy that the burning natural gas was collected is used for the printing shop to supply power, tail gas waste heat in the system is the middle temperature section, the low temperature section energy, be used for the printing shop refrigeration and to the gaseous intensification of desorption of zeolite runner.
Claims (3)
1. A distributed energy system for purifying VOCs in printing industry is characterized by comprising a printing workshop (1), a fan I (2), a zeolite rotating wheel (3), a heat exchanger (4), an absorption refrigerator (5), a chimney (6), a natural gas generator set (7) and a fan II (8); the printing workshop (1) is connected fan I (2), is divided into three mutual isolation's subregion on zeolite runner (3): an adsorption zone, a desorption zone and a cooling zone; fan I (2) are connected with zeolite runner (3) adsorption zone, the adsorption zone other end and atmosphere UNICOM, fan I (2) still are connected with zeolite runner (3) cooling zone, zeolite runner (3) cooling zone other end is connected with heat exchanger (4) entry end, heat exchanger (4) exit end is connected with zeolite runner (3) desorption zone, the desorption zone other end is connected with fan II (8), fan II (8) are connected with absorption refrigerator (5), absorption refrigerator (5) respectively with chimney (6), printing workshop (1) refrigeration district, natural gas generating set (7) combustion chamber is connected, natural gas generating set (7) are connected with printing workshop (1).
2. The distributed energy system for purifying VOCs in the printing industry according to claim 1, wherein a tail gas outlet of the natural gas generator set (7) is connected with the heat exchanger (4).
3. The distributed energy system for purifying VOCs in the printing industry according to claim 1, wherein a tail gas outlet of the natural gas generator set (7) is connected with the absorption refrigerator (5).
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